CVE-2026-81780 WordPress Hash Form plugin <= 1.4.2 - Arbitrary File Upload vulnerability
Critical 10.0
Published
Updated
Check this codebase for CVE-2026-81780 and fix it if it is affected.
What it is: CVE-2026-81780 is a critical vulnerability in hashthemes Hash Form, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-81780 in the wild and no public exploit code.
Affected product: hashthemes Hash Form. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-81780/ (Markdown: https://insights.sbomify.com/CVE-2026-81780/index.md)
Unauthenticated attackers can upload arbitrary files to the Hash Form WordPress plugin, potentially leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81780?
CVE-2026-81780 is a critical vulnerability in hashthemes Hash Form, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unauthenticated Arbitrary File Upload in Hash Form <= 1.4.2 versions.
Weakness: CWE-434
Which versions are affected by CVE-2026-81780?
How do I fix CVE-2026-81780?
No fix has been published for CVE-2026-81780 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81780 being exploited?
There is no known exploitation of CVE-2026-81780 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Sources
Also known as GHSA-chvv-mh28-xhg5.